package com.example.demo.handler;


import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@Component
public class CustomLoginFailureHandler implements AuthenticationFailureHandler {

    @Autowired
    private ObjectMapper objectMapper;

    @Override
    public void onAuthenticationFailure(
            HttpServletRequest request,
            HttpServletResponse response,
            AuthenticationException exception
    ) throws IOException {
        // 构建错误信息
        Map<String, Object> result = new HashMap<>();
        result.put("code", 401);
        result.put("message", "登录失败: " + exception.getMessage());

        // 设置响应格式
        response.setStatus(HttpStatus.UNAUTHORIZED.value());
        response.setContentType("application/json;charset=UTF-8");
        response.getWriter().write(objectMapper.writeValueAsString(result));
    }
}
